Lower box body of power battery

Abstract

The invention discloses a lower box body of a power battery. The lower box body comprises a power battery module assembly, a frame beam assembly and a steel lower bottom plate, wherein the main body of the frame beam assembly is an extruded aluminum profile; the frame beam assembly comprises a front edge beam, a rear edge beam, left and right edge beams, corner edge beams, cross beams and longitudinal beams; u-shaped openings are formed in the lap joint positions of the cross beams on the front side and the rear side and the longitudinal beams, and steps are arranged on the lap joint positionsof the longitudinal beams and the cross beams on the front side and the rear side; an n-shaped opening is formed in the position, in lap joint with the longitudinal beam, of the middle cross beam, and a u-shaped opening is formed in the position, in lap joint with the middle cross beam, of the longitudinal beam; rivet nuts are evenly distributed on the upper side and the lower side of the edge beam along the line, sealing foam is attached to the upper box body on the upper side of the frame beam assembly, sealing foam is attached to the lower bottom plate on the lower side of the frame beam assembly, and the frame beam assembly is fixed to the upper box body through upper box body fastening bolts and the rivet nuts and fixed to the lower bottom plate through lower bottom plate fastening bolts and the rivet nuts. The composite material is light in weight, low in cost and high in impact resistance and extrusion resistance.

Description

Technical field[0001]The invention belongs to the field of power batteries, and specifically relates to a lower box body of a power battery.Background technique[0002]The power battery box is an important structural component of the power battery, and the existing power battery systems mostly use cast / sheet metal / profile box integrated lithium battery modules. The casting technology is mature and the cost is low, but the weight of the casting box is large, resulting in the low efficiency of the battery system; the sheet metal technology improves the defect of the heavy weight of the casting box, but its assembly process is complicated and the box sealing design is complicated; the aluminum profile technology is improved Because of the shortcomings of the two, they are widely used in battery system cabinets, but their cost is high, the bottom impact resistance is insufficient, and the space utilization rate is not high; the aluminum profile-based CTP technology (cell to pack, without ...

AI Technical Summary

Problems solved by technology

In the above scheme, the frame of the battery box is directly welded without any special lap joint structure design, so the overall strength of the box is not high, and the pallet as the load-bearing structure is also an aluminum alloy extruded profile, so the impact resistance of the box Insufficient capacity can also easily lead to damage to the water cooling plate and internal short circuit of the battery system

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